Designate one non-player as the referee. The referee is the sole
authority during play and is responsible for settling disputes and ensuring
fair play.

The referee begins play only after all players are standing in the
gaga court and have indicated that they are ready to start the game.

One player tosses the ball up in the air. Players yell "ga"
on the first bounce and "ga" again on the second bounce, and
the ball is then in play.

Players hit the ball with their hands only, and may not carry or throw
the ball - it must be punched with open hand or fist.

Anytime the ball hits a wall, it then can be caught by another player
and they begin to punch the ball along the ground.

Any player who is touched by the ball either directly or by a rebound
off the wall is "out" and must step out of the circle.

If the ball contacts a player or a player's clothing below the waist,
that player is eliminated. If the the ball contacts the player above
the waist, the player is still in.

If the ball goes out of the gaga court, the last player to touch the
ball is eliminated.

If a player catches the ball before it bounces, the player who had
the last contact with the ball is eliminated.

Once the player hits the ball, he or she must wait until the ball
touches someone else before hitting it again (no double touches).

If there are only two players remaining, a player may hit the ball
up to 3 times in a row. The ball is "rejuvenated" by contact
with the wall, and the hit count resets.

Some Ga-Ga games are designed to be team efforts, although the sport
is traditionally a one-against-all competition. Teaming, or intentional
passing of the ball to other players, is allowed only at the discretion
of the referee and must be specified in advance of play.

There are plenty of variations available, and like 4-square, you can
certainly make your own house rules!